Process for producing olefin oligomer

[0049]A glass vessel having a 50 mL inner-volume and equipped with a stirrer was dried in a vacuum, and then it was purged with a nitrogen gas. There were supplied thereto 5.0 mL of a tetrahydrofuran solution having a concentration of 2.0 mmol / L of trichlorotris(tetrahydrofuran)chromium(III) (transition metal compound represented by the formula (2)), and 5.0 mL of a tetrahydrofuran solution having a concentration of 2.0 mmol / L of (2-methoxyphenyl)2PN(methyl)P(2-methoxyphenyl)2 (compound represented by the formula (1)), and the resultant mixture was stirred for two hours at room temperature to obtain a reaction mixture. The solvent (tetrahydrofuran) contained in the reaction mixture was evaporated to dryness under reduced pressure, thereby obtaining a solid. Said solid was supplied with 10 mL of toluene to produce a suspension (a) containing a chromium atom in a concentration of 1.0 mmol / L.

[0050]An autoclave having a 0.4 L inner-volume and equipped with a stirrer and a catalyst feede...

[0068]A glass vessel having a 50 mL inner-volume and equipped with a stirrer was dried in a vacuum, and then it was purged with a nitrogen gas. There were supplied thereto 0.7 mL of toluene, 2.0 mL of a toluene solution having a concentration of 1.0 mol / L of triisobutylaluminum (organoaluminum compound), and 1.3 mL of a toluene solution having an aluminum atom-concentration of 2.47 mol-Al / L of methylalumoxane (alumoxane compound) and having a trade-name of PMAO-S manufactured by Tosoh-finechem, and the resultant mixture was stirred for 10 minutes at room temperature to prepare an aluminum-containing solution.

[0069]Another glass vessel having a 50 mL inner-volume and equipped with a stirrer was dried in a vacuum, and then it was purged with a nitrogen gas. There were supplied thereto 5.0 mL of a tetrahydrofuran solution having a concentration of 2.0 mmol / L of trichlorotris(tetrahydrofuran)chromium(III) (transition metal compound represented by the formula (2)), and 5.0 mL of a tetrah...

[0073]A glass vessel having a 50 mL inner-volume and equipped with a stirrer was dried in a vacuum, and then it was purged with a nitrogen gas. There were supplied thereto 0.7 mL of toluene, 2.0 mL of a toluene solution having a concentration of 1.0 mol / L of tri-n-octylaluminum (organoaluminum compound), and 1.3 mL of a toluene solution having an aluminum atom-concentration of 2.47 mol-Al / L of methylalumoxane (alumoxane compound) and having a trade-name of PMAO-S manufactured by Tosoh-finechem, and the resultant mixture was stirred for 10 minutes at room temperature to prepare an aluminum-containing solution.

[0074]Another glass vessel having a 50 mL inner-volume and equipped with a stirrer was dried in a vacuum, and then it was purged with a nitrogen gas. There were supplied thereto 5.0 mL of a tetrahydrofuran solution having a concentration of 2.0 mmol / L of trichlorotris(tetrahydrofuran)chromium(III) (transition metal compound represented by the formula (2)), and 5.0 mL of a tetrah...